<template>
	<view class="uni-data-tree" :style="styleData">
		<view class="uni-data-tree-input" @click="handleInput">
			<slot :options="options" :data="inputSelected" :error="errorMessage">
				<view class="input-value" :class="{ 'input-value-border': border }">
					<text v-if="errorMessage" class="selected-area error-text">{{ errorMessage }}</text>
					<view v-else-if="loading && !isOpened" class="selected-area">
						<uni-load-more class="load-more" :contentText="loadMore" status="loading"></uni-load-more>
					</view>
					<scroll-view v-else-if="inputSelected.length" class="selected-area" scroll-x="true">
						<view class="selected-list">
							<view class="selected-item" v-for="(item, index) in inputSelected" :key="index">
								<text>{{ item.text }}</text><text v-if="index < inputSelected.length - 1"
									class="input-split-line">{{ split }}</text>
							</view>
						</view>
					</scroll-view>
					<text v-else class="selected-area placeholder">{{ placeholder }}</text>
					<view class="arrow-area" v-if="!readonly && border">
						<view class="input-arrow"></view>
					</view>
				</view>
			</slot>
		</view>
		<view class="uni-data-tree-cover" v-if="isOpened" @click="handleClose"></view>
		<view class="uni-data-tree-dialog" v-if="isOpened">
			<view class="dialog-caption">
				<view class="title-area">
					<text class="dialog-title">{{ popupTitle }}</text>
				</view>
				<view class="dialog-close" @click="handleClose">
					<view class="dialog-close-plus" data-id="close"></view>
					<view class="dialog-close-plus dialog-close-rotate" data-id="close"></view>
				</view>
			</view>
			<data-picker-view class="picker-view" ref="pickerView" v-model="value" :localdata="localdata"
				:preload="preload" :collection="collection" :field="field" :orderby="orderby" :where="where"
				:step-searh="stepSearh" :self-field="selfField" :parent-field="parentField" :managed-mode="true"
				@change="onchange" @datachange="ondatachange"></data-picker-view>
		</view>
	</view>
</template>

<script>
import dataPicker from "../uni-data-pickerview/uni-data-picker.js"
import DataPickerView from "../uni-data-pickerview/uni-data-pickerview.vue"

/**
 * uni-data-picker
 * @description uni-data-picker
 * @tutorial https://uniapp.dcloud.net.cn/uniCloud/uni-data-picker
 * @property {String} popup-title 弹出窗口标题
 * @property {Array} localdata 本地数据，参考
 * @property {Boolean} border = [true|false] 是否有边框
 * @property {Boolean} readonly = [true|false] 是否仅读
 * @property {Boolean} preload = [true|false] 是否预加载数据
 * @value true 开启预加载数据，点击弹出窗口后显示已加载数据
 * @value false 关闭预加载数据，点击弹出窗口后开始加载数据
 * @property {Boolean} step-searh = [true|false] 是否分布查询
 * @value true 启用分布查询，仅查询当前选中节点
 * @value false 关闭分布查询，一次查询出所有数据
 * @property {String|DBFieldString} self-field 分布查询当前字段名称
 * @property {String|DBFieldString} parent-field 分布查询父字段名称
 * @property {String|DBCollectionString} collection 表名
 * @property {String|DBFieldString} field 查询字段，多个字段用 `,` 分割
 * @property {String} orderby 排序字段及正序倒叙设置
 * @property {String|JQLString} where 查询条件
 * @event {Function} onpopupshow 弹出的选择窗口打开时触发此事件
 * @event {Function} onpopuphide 弹出的选择窗口关闭时触发此事件
 */
export default {
	name: 'UniDataPicker',
	mixins: [dataPicker],
	components: {
		DataPickerView
	},
	props: {
		options: {
			type: [Object, Array],
			default() {
				return {}
			}
		},
		popupTitle: {
			type: String,
			default: '请选择'
		},
		placeholder: {
			type: String,
			default: '请选择'
		},
		heightMobile: {
			type: String,
			default: ''
		},
		readonly: {
			type: Boolean,
			default: false
		},
		border: {
			type: Boolean,
			default: true
		},
		split: {
			type: String,
			default: '/'
		},
		styleData: {
			type: String,
			default: ''
		}
	},
	data() {
		return {
			isOpened: false,
			inputSelected: []
		}
	},
	created() {
		this.form = this.getForm('uniForms')
		this.formItem = this.getForm('uniFormsItem')
		if (this.formItem) {
			if (this.formItem.name) {
				this.rename = this.formItem.name
				this.form.inputChildrens.push(this)
			}
		}

		this.$nextTick(() => {
			this.load()
		})
	},
	methods: {
		onPropsChange() {
			this._treeData = []
			this.selectedIndex = 0
			this.load()
		},
		load() {
			if (this.readonly) {
				this._processReadonly(this.localdata, this.value)
				return
			}

			if (this.isLocaldata) {
				this.loadData()
				this.inputSelected = this.selected.slice(0)
			} else if (this.value.length) {
				this.getTreePath(() => {
					this.inputSelected = this.selected.slice(0)
				})
			}
		},
		getForm(name = 'uniForms') {
			let parent = this.$parent;
			let parentName = parent.$options.name;
			while (parentName !== name) {
				parent = parent.$parent;
				if (!parent) return false;
				parentName = parent.$options.name;
			}
			return parent;
		},
		clear() {
			this.inputSelected = []
		},
		show() {
			this.isOpened = true
			this.$nextTick(() => {
				this.$refs.pickerView.updateData({
					treeData: this._treeData,
					selected: this.selected,
					selectedIndex: this.selectedIndex
				})
			})
		},
		hide() {
			this.isOpened = false
		},
		handleInput() {
			if (this.readonly) {
				return
			}
			this.show()
		},
		handleClose(e) {
			this.hide()
		},
		ondatachange(e) {
			this._treeData = this.$refs.pickerView._treeData
		},
		onchange(e) {
			this.hide()
			this.inputSelected = e
			this._dispatchEvent(e)
		},
		_processReadonly(dataList, valueArray) {
			var isTree = dataList.findIndex((item) => {
				return item.children
			})
			if (isTree > -1) {
				if (Array.isArray(valueArray)) {
					let inputValue = valueArray[valueArray.length - 1]
					if (typeof inputValue === 'object' && inputValue.value) {
						inputValue = inputValue.value
					}
				}
				this.inputSelected = this._findNodePath(inputValue, this.localdata)
				return
			}

			let result = []
			for (let i = 0; i < valueArray.length; i++) {
				var value = valueArray[i]
				var item = dataList.find((v) => {
					return v.value == value
				})
				if (item) {
					result.push(item)
				}
			}
			if (result.length) {
				this.inputSelected = result
			}
		},
		_filterForArray(data, valueArray) {
			var result = []
			for (let i = 0; i < valueArray.length; i++) {
				var value = valueArray[i]
				var found = data.find((item) => {
					return item.value == value
				})
				if (found) {
					result.push(found)
				}
			}
			return result
		},
		_dispatchEvent(selected) {
			var value = new Array(selected.length)
			for (var i = 0; i < selected.length; i++) {
				value[i] = selected[i].value
			}

			if (this.formItem) {
				const item = selected[selected.length - 1]
				this.formItem.setValue(item.value)
			}

			this.$emit('change', {
				detail: {
					value: selected
				}
			})
		}
	}
}
</script>

<style scoped>
.uni-data-tree {
	position: relative;
	font-size: 14px;
}

.error-text {
	color: #DD524D;
}

.input-value {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	align-items: center;
	flex-wrap: nowrap;
	font-size: 14px;
	line-height: 38px;
	padding: 0 5px;
	overflow: hidden;
	/* #ifdef APP-NVUE */
	height: 40px;
	/* #endif */
}

.input-value-border {
	border: 1px solid #e5e5e5;
	border-radius: 5px;
}

.selected-area {
	flex: 1;
	overflow: hidden;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
}

.load-more {
	/* #ifdef APP-NVUE */
	width: 40px;
	/* #endif */
	/* #ifndef APP-NVUE */
	margin-right: auto;
	/* #endif */
}

.selected-list {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	flex-wrap: nowrap;
	padding: 0 5px;
}

.selected-item {
	flex-direction: row;
	padding: 0 1px;
	/* #ifndef APP-NVUE */
	white-space: nowrap;
	/* #endif */
}

.placeholder {
	color: grey;
}

.input-split-line {
	opacity: .5;
}

.arrow-area {
	position: relative;
	width: 20px;
	/* #ifndef APP-NVUE */
	display: flex;
	margin-left: auto;
	/* #endif */
	justify-content: center;
	transform: rotate(-45deg);
	transform-origin: center;
}

.input-arrow {
	width: 7px;
	height: 7px;
	border-left: 1px solid #999;
	border-bottom: 1px solid #999;
}

.uni-data-tree-cover {
	position: fixed;
	left: 0;
	top: 0;
	right: 0;
	bottom: 0;
	background-color: rgba(0, 0, 0, .4);
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: column;
	z-index: 100;
}

.uni-data-tree-dialog {
	position: fixed;
	left: 0;
	top: 20%;
	right: 0;
	bottom: 0;
	background-color: #FFFFFF;
	border-top-left-radius: 10px;
	border-top-right-radius: 10px;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: column;
	z-index: 102;
	overflow: hidden;
	/* #ifdef APP-NVUE */
	width: 750rpx;
	/* #endif */
}

.dialog-caption {
	position: relative;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	border-bottom: 1px solid #f0f0f0;
}

.title-area {
	/* #ifndef APP-NVUE */
	display: flex;
	margin: auto;
	/* #endif */
	align-items: center;
	padding: 0 10px;
}

.dialog-title {
	font-weight: bold;
	line-height: 44px;
}

.dialog-close {
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	align-items: center;
	padding: 0 15px;
}

.dialog-close-plus {
	width: 16px;
	height: 2px;
	background-color: #666;
	border-radius: 2px;
	transform: rotate(45deg);
}

.dialog-close-rotate {
	position: absolute;
	transform: rotate(-45deg);
}

.picker-view {
	flex: 1;
	overflow: hidden;
}

/* #ifdef H5 */
@media all and (min-width: 768px) {
	.uni-data-tree-cover {
		background-color: transparent;
	}

	.uni-data-tree-dialog {
		position: absolute;
		top: 100%;
		height: auto;
		min-height: 400px;
		max-height: 50vh;
		background-color: #fff;
		border-radius: 5px;
		box-shadow: 0 0 20px 5px rgba(0, 0, 0, .3);
	}

	.dialog-caption {
		display: none;
	}
}

/* #endif */
</style>
